I don't understand one thing demon slayer shows lot of brutality then also it is a Shonen manga on the other hand one piece shows no brutality because of being Shonen.

I mean one piece should also show some brutality.
Oda just doesn't like that I guess. But One Piece can be pretty brutal, I mean slavery exists and all that gross stuff.

Remember though, that this manga is mostly aimed at 12-14 year olds.
 
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